Vacuum brazing filler metal has excellent process performance, suitable melting point, good wettability and gap filling performance. The brazing filler metal has good plasticity, excellent conductivity, and high mechanical strength of brazing joints. It can be used for brazing various materials such as copper alloys, titanium alloys, stainless steel, carbon steel, and hard alloys. The vacuum brazing filler metal is usually welded in a vacuum furnace or used with a brazing flux to obtain excellent joints.